Merge pull request #19 from xerxes1986/master

Added ability to rescale histograms used in ZprimeAnalysis
Updated output for TopPtReweighter
bug fix in top-pt re-weighting
Merge pull request #20 from xerxes1986/master

bug fixes & added ability to predefine average weight for topptreweighter
Merge branch 'master' of https://github.com/UHHAnalysis/SFrameAnalysis
Added ability to disable topptreweight, both smooth and sharp